Abstract: Water-based paints with natural dyes are interesting to investigate, in particular with a view to the reduction of defects. This study aims also to report on the properties of water-based paints containing natural dyes of Ceriops candolleana Arn. in the context of parameters such as total solids, hiding power, drying time and gloss. The water-based paints were formulated from acrylic resin, water, polyethylene glycol and surfactant. The natural dyes and filler used were C. candolleana and TiO powders, respectively. The sizes of the natural 2 dye powders were examined using a particle size analysis instrument. The water-based paints were formulated with various concentrations of Pigment Volume Concentration (PVC) varying from 2.9-22.7%. The Filler Volume Concentration (FVC) used was 0, 1.4 and 2.8%. The results show that the water-based paints formulated using natural dyes from C. candolleana suffered defects such as agglomeration, bubbling and cracking. These defects were strongly affected by the concentrations of PVC and FVC. Water-based paints with fewer defects could be achieved, however, by formulating the paint with concentrations of PVC and FVC below 8 and 2.8%, respectively. The total solids, hiding power, drying time and gloss from the water-based paints with C. candolleana natural dyes were 40-46%, 5.8-13.7 m2/L, 40-95 min and 9.5-56.6 GU, respectively and as such satisfied the SNI Standard 3564: 2009 for paints.
Catur Harsito and Suyitno , 2018. Reducing Defects in Water-Based Paint with Natural Dyes. Journal of Engineering and Applied Sciences, 13: 1291-1297. Asian Journal of Information Technology, 18: 250-260.